If your boat's electrical panel has reached its capacity, like this, one option for accommodating new electronics is an accessory panel like those PS tested.

You just finished adding some important electronics to your boat—let's say a new VHF, and a combination knotmeter-depthsounder. Now, how do you get electricity to these items? Install a small accessory electrical panel, of course.

The American Boat and Yacht Council (ABYC) calls a panelboard "a collection of circuit breakers, switches, and instrumentation installed into a panel which provides the central point for power distribution and monitoring for electrical systems." Panel boards are commonly referred to as circuit breaker, distribution, fuse, or electrical panels.…